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      <p>2</p>
      <p>2</p>
      <p id="xxx">我是id为xxx的标签</p>
      <p>3</p>
      <p>4</p>
      <a href="http://www.baidu.com">http百度网站</a><br />
      <a href="https://www.baidu.com">https百度网站</a><br />
      <a href="//baidu.com">无协议网址百度</a><br />
      <a href="./test.html">跳转到a-href</a><br />
      <a href="#xxx">跳转到id为xxx的标签</a><br />
      <a href="javascript:;">无反应a标签</a> <br />
      <a href="javascript:alert('a标签js伪协议');">js伪协议</a><br />
      <a href="mailto:1304879929@qq.com">发邮件给我</a><br />
      <a href="tel:19120638474">联系我！</a>
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    <p>1</p>
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